Re: Efficient Create Swap File?

2009-03-28 Thread Roberto Ragusa
Mike McCarty wrote: $ diff -s file1 file2 Files file1 and file2 are identical Identical? Try this: du file1 file2 and you will see that one of them has not allocated disk blocks, it is sparse (has holes). IIRC sparse files are unacceptable for swap (the recent swap files are as fast as

Efficient Create Swap File?

2009-03-27 Thread Mike McCarty
I've seen various recommendations for adding swap files after system creation, and it occurs to me that the standard technique may not be the most efficient. I realize that one rarely creates swap files, but nonetheless on occasion one needs to precreate some file or other, then do something to

Re: Efficient Create Swap File?

2009-03-27 Thread Todd Denniston
Mike McCarty wrote, On 03/27/2009 04:01 PM: I've seen various recommendations for adding swap files after system creation, and it occurs to me that the standard technique may not be the most efficient. I realize that one rarely creates swap files, but nonetheless on occasion one needs to

Re: Efficient Create Swap File?

2009-03-27 Thread Cameron Simpson
On 27Mar2009 14:01, Mike McCarty mike.mcca...@sbcglobal.net wrote: I've seen various recommendations for adding swap files after system creation, and it occurs to me that the standard technique may not be the most efficient. I realize that one rarely creates swap files, but nonetheless on

Re: Efficient Create Swap File?

2009-03-27 Thread Mikkel L. Ellertson
Todd Denniston wrote: This brings up a question for me... If using the first method, while in use or during the mkswap command, does the bits written to the file end up at the same physical locations as the 0s they are replacing? Yes - you are saving back to the same file. Not like a work